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E46 battery not holding charge

BMW forum 3 series car: E21, E30, E36, E46, E90, E91, E92, E93, F30, F31, F34, F35

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E46 battery not holding charge

Postby mr tart » Tue, 25 Nov 2003 10:29:21 UTC

Hi guys,

W reg 2000 318i SE not holding its charge recently and I am constantly having to jump it. Before I go out and buy a new battery does anyone know of anything else I should check or get checked in case its not the battery?

mr tart

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Postby Hasso » Tue, 25 Nov 2003 12:06:37 UTC

You may first charging the battery you got.
fore 48 hours at least. With a low ampere charger (9amp)
How do you drive your car??
Short distance every day?? less then 30km a day.
You must charging the battery twice a year with a charger.
If you use lots of power on short distance driven the altenator cant leave any charge to battery only to the power you use fore the car. Then you lose a little bit of batterycapacity every time.
Chech fore loose cabels and chech that you have at least 14.2V over battery when engine is running.

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Postby Ranger 6 » Tue, 25 Nov 2003 14:39:09 UTC

Battery shouldn't be going down that quickly - check the interior lights (don't forget the boot & Glove box!) are all going out ok.


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Postby mr tart » Wed, 26 Nov 2003 12:16:16 UTC

cheers guys.
It was on charge overnight although the charger still does not say "max charge". It started fine this morning and I'll put it on charge again tonight.
Hopefully all will be well.

mr tart

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Postby Pinkpounder » Mon, 08 Dec 2003 14:11:26 UTC

I had the exact same problem, the battery has to have at least 12v of power or when you try to start up you hear click click, it was due to a faulty cell in the battery and no amount of charging would fix it. sorry you need a new battery.

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Drain on battery

Postby brodd » Sun, 14 Dec 2003 16:23:21 UTC

Similar problem,eventually traced to central locking circuit. pulled the fuse out,had no problem since except to remember to lock all the doors and the boot individually before retiring.
Hope it might be of any use.

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Postby Saint » Mon, 15 Dec 2003 09:24:24 UTC

I had this prob on my e36 diesel (with bigger battery than petrol). Fault came down to a short in the radio.

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Postby markf » Tue, 16 Dec 2003 19:16:23 UTC

Mine was due to a broken boot lid light sensor. I proved it by shutting my 12-year-old daughter inside, and she reported the light didn't go off!

A lot cheaper than an unnecessary new battery.

But you do need to remember to let your beloved offspring out afterwards...

Mark Farrington

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